A student added the following substances to water kept in four separate beakers. He stirred the mixture well and filtered each one of them through a filter paper. He would obtain a solid residue on the filter paper in the case of :(1) egg albumin (2) common salt (3) chalk powder (4) alum

Correct Answer: (3) chalk powder

Explanation: Chalk powder (calcium carbonate) is insoluble in water as it forms a precipitate in water and does not dissolve, so chalk powder will be obtained from filter paper.